Punch and die for tearing paper



April 28, 1964 J, 5, FLEMING PUNCH AND DIE FOR TEARING PAPER 4Sheets-Sheet 1 INVENTOR. John Stuart Fleming .Qhwmdh ATTORNEY FIG.|.

April 28, 1964 J s, FLEMlNG 3,130,885

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United States Patent 3,130,885 PUNCH AYD DIE FOR TEARING PAPER JohnStuart Fleming, 117 Buffalo Ave., Niagara Falls, N.Y. Filed Nov. 1,1962, Ser. No. 234,759 6 Claims. (Cl. 225-97) The invention relates to amachine for tearing from a paper work sheet a paper strip having thesoft cushioned edge disclosed in the Fleming Patent Number 2,856,939,dated October 21, 1958.

An object is to provide a punch and die machine for tearing from a paperwork sheet a paper strip having, the soft cushioned edge as aforesaid,with the added feature of said soft edge being a serrated soft edge,that is to say it consists of a continuous series of approximatelyuniform serrations, found in practice to have improved dental cleaningeffect inasmuch as in addition to other advantages it is better adaptedfor the reception of food particles within the notches of the serrationsand dragging them from between the teeth during the movement of saidstrip between the teeth of the person using the said paper strip andagainst the gums.

Another object is to provide a punch and die machine for punching from apaper work sheet paper strips of varied patterns, such for example asmultilateral, polygonal, oval or round strips.

Other objects and advantages will appear hereinafter or will be obvious.

The invention consists in the novel construction and combinations ofparts hereinafter set forth in the claims.

In the accompanying drawings,

FIGURE 1 is a bottom plan view of the punch for a rhomboid strip, beingpart of one embodiment of the invention.

FIGURE 2 is a side view of the same.

FIGURE 3 is an end view of the same.

FIGURE 4 is a top plan view of the die for said embodiment.

FIGURE 5 is a side view of the machine with the punch in raised positionand the Work sheet in place between the punch and the die.

FIGURE 6 is a view similar to FIGURE 5, with the punch in its lowerposition and the strip punched from the work sheet.

FIGURE 7 is a perspective view of the punch for a rectangular strip.

FIGURE 8 is a perspective view of a modification thereof.

FIGURE 9 shows plan and edge views of the rhomboid strip.

FIGURE 10 is a bottom plan view of the punch part of a second embodimentof the invention.

FIGURE 11 is a side view of the same.

FIGURE 12. is an end view of the same.

FIGURE 13 is a top plan view of the die for said second embodiment.

FIGURE 14 is a side view of the same.

FIGURE 15 shows plan and edge views of the strip produced by the machineof said second embodiment.

FIGURE 16 is a perspective view of the punch part of said secondembodiment.

FIGURE 17 is a side View of the punch part of a third embodiment of theinvention.

FIGURE 18 is a bottom plan view of'the same.

FIGURE 19 shows plan and edge views of thestrip produced by the machineof said third embodiment.

FIGURE 20 is a plan view of a fragment of said strip produced by themachine of said third embodiment.

FIGURE 21 is a section on the line 21-41, FIG- URE 20.

3,130,885 Patented Apr. 28, 1964 FIGURE 21a is a section on the line21a21a, FIG- URE 20.

FIGURE 2.2 is a fragmentary plan view, showing on an enlarged scale thesoft edge of the paper strip constituted by its serrations and the teethof the die serrations piercing, that is to say in penetrating engagementwith, said soft edge.

FIGURE 23 is a view similar to FIG. 22 of the soft edge constituted byits serrations.

FIGURE 24 is a bottom plan vie of the punch part of a fourth embodimentof the invention, the machine of which is adapted to produce a foldablestrip consisting of two rhomboid strips joined together and foldable atthe joint.

FIGURES 25, 26 and 27 are plan views of the paper work sheet showing. onan enlarged scale the progressive tearing of the rhomboid paper stripout of the work sheet by progressive downward movement of the punch.

FIGURE 28 is a fragmentary vertical section on an enlarged scale showingthe initial contact of the punch with the work sheet.

FIGURE 29 is a view similar to FIGURE 28 showing the punch. depressingand tearing a part of the inchoate strip out of the work sheet and thesoft torn edge of the inchoate strip in a. notch of the die serrations.

FIGURE 30 is a view similar to FIGURE 29 showing the punch at the end ofits downward movement and the paper strip punched out of the work sheet.

FIGURE 31 is a bottom plan view of the work sheet showingdiagrammatically the initial contact of the punch therewith at the fourcorners and also at points intermediately of the length of the narrowelongated paper strip.

The punch and die machine for tearing from a paper work sheet A, a paperstrip B, having opposite sofit beveled edges each constituted by acontinuous series of uniform serrations D, is described as follows:

In the drawings, the numeral 1 designates the die, having an opening 2,opposite sides of which are each provided with a continuous series ofuniform horizontally projecting serrations comprising teeth 3 landnotches 4, between said teeth. The punch 5, adapted to work within saidopening within the'inner ends of the teeth of said serrations, has arecessed bottom 6, the surfaces 7 of which are inclined at a low angleto the horizontal and intersect the opposite vertical walls of the punchat acute" angles '8, said bottom surfaces intersecting each other atobtuse angles 9.

-In operation, the punch is forced down within said die opening withinthe inner ends of the teeth of said die serrations and guided for truevertical movement precise- 1y aligned with the die, by guide posts 1'0of the die engaging perforations 11 of the punch, the Work sheet Ainterposed between the die and the punch being held securely againstthat portion of the die marginal to its said opening by aresilientcushion 12' of'sponge rubber or its equivalent interposed between thedie and the punchabove the work sheet, said cushion being compressedduring the punching.

The tear of the work sheet to provide the" paper strip with oppositesoft beveled edges each constituted by a continuous series of uniformserrations is described as follows:

As the work sheet is progressively stretched taut across the die openingby progressive downward movement of the punch, the punchfirst contactsand depresses the work sheet at the four corners of the inchoa-te ship,as

points of resistance from which the tear is started, and being continuedin conformity with the shape of the die serrations but out of contacttherewith to further depress and tear said four corners of the inchoatestrip out of the work sheet and push them edgewise into penetratingengagement with the next succeeding teeth of the die serrations, whichends the tear cycle and completes one step or cycle of the tear. Saidsecond penetrating engagement with the next succeeding teeth of the dieserrations in turn star-ts a second tear cycle, this operation beingcontinued with progessive alternate penetra-ting engagement and tearuntil the tearing of the paper strip out of the work sheet is completedand the completed strip is pressed down out of the work sheet at the endof the downward movement of the punch.

The stretching of the work sheet taut across the die opening and thepushing of said corners progressively into penetrating engagement withthe teeth of the die serrations is due to the low angle to thehorizontal of said bottom surfaces '7 of the punch and the intersectionof said bottom surfaces with the vertical wall of the punch at acuteangles 8. The intersection of said bottom surfaces with each other atobtuse angles 9 is necessary to complete the tearing operation.

The serrations D of the paper strip are quite uniform and closetogether, and the adjacent edges thereof have approximate right anglerelation to each other.

If the strip is a narrow elongated strip as in FIG. 14 of length aboutsix inches and width one-quarter inch, the related narrow elongatedpunch first contacts the work sheet at said four corners and also attwo-inch intervals intermediate thereof, as in FIG. 27. This is becausethe low inclination to the horizontal of the bottom surfaces 7 of thepunch is subject to only slight variation, due to the thinness of thepaper.

Inasmuch as the punch is moved downwardly within the die opening withinthe inner ends of the teeth of the die serrations, and the resultingpaper strip serrations D which constitute its soft edge extend withinthe notches of the die serrations, the area of the paper strip B islarger than the area of the die opening 2 to the extent of the paperstrip serrations constituting its soft edge.

The serrated soft edges D of the paper strip B are beveled and have thepulp of the paper exposed upon one side B thereof, and are provided withthe thin superficial coating C of water repellant material upon theirnonbeveled sides to support said soft edge against undue verticalyielding during movement of said strip between adjacent teeth andagainst the gums, the pressure load being distributed between said softedge and said coating.

The right is reserved to modifications coming within the scope of theclaims.

The second, third and fourth embodiments have the same referencecharacters applied thereto as has said first embodiment butdistinguished therefrom by the exponents, for said second embodiment,for said third embodiment, and for said fourth embodiment.

I claim:

1. In a punch and die machine means for tearing from a paper work sheeta paper strip having opposite soft beveled edges constituted by acontinuous series of uniform serrations, comprising a die having anopening, opposite sides of which are each provided with a continuousseries of uniform horizontally projecting serrations and a punch adaptedto work within said opening within the inner ends of the teeth of saiddie serrations, said punch having a recessed bottom the surfaces ofwhich are inclined at a low angle to the horizontal and which intersectthe opposite vertical walls of the punch at acute angles.

2. A punch and die machine as defined in claim 1, in which said bottomsurfaces intersect the vertical walls of the punch at acute anglesextending entirely around the punch, and said bot-tom surfaces intersecteach other at obtuse angles.

3. In a punch and die machine, means for tearing from a paper work sheeta narrow elongated paper strip having opposite soft beveled edgesconstituted by a continuous series of uniform serrations, comprising adie having a narrow elongated rectangular opening, and a narrowelongated rectangular punch workable within said opening within theinner ends of the teeth of the die serrations, said punch having arecessed bottom the surfaces of which are inclined at a low angle to thehorizontal, the endmost of said bottom surfaces intersecting theopposite vertical end walls of the punch at acute angles, said bottomsurfaces intersecting each other at obtuse angles.

4. In a punch and die machine means for tearing from a paper work sheeta foldable paper strip consisting of two rhomboid strips joined togetherand foldable at the joint, said strip having opposite soft beveled edgeseach constituted by a continuous series of uniform serrations,comprising a die having an opening the shape of which corresponds tothat of said strip, the opposite sides of said opening being eachprovided with a continuous series of uniform serrations, and a punch ofsaid shape workable within said opening within the inner edges of theteeth of the die serrations, said punch having a recessed bottom thesurfaces of which are inclined at a low angle to the horizontal andwhich intersect the vertical Walls of the punch at acute angles entirelyaround the punch, said bottom surfaces intersecting each other at obtuseangles.

5. In a punch and die machine means for tearing from a paper work sheeta rhomboid paper strip having opposits soft beveled edges eachconstituted by a continuous series of uniform serrations, comprising adie having an opening the shape of which corresponds to that of saidstrip, the opposite sides of said opening being each provided with acontinuous series of uniform serrations, and apunch of said shapeworkable within said opening within the inner ends of the teeth of thedie serrations, said punch having a recessed bottom the surfaces ofwhich are inclined at a low angle to the horizontal and which intersectthe vertical walls of the punch at acute angles entirely around thepunch, said bottom surfaces intersecting each other at obtuse angles.

6. In a punch and die machine means for tearing from a paper work sheetan oval paper strip having a soft beveled edge extending entirely aroundit, said soft edge being constituted by a continuous series of uniformser-: rations, comprising a die having an opening of oval shape, saidopening having a continuous series of uniform serrations extendingentirely around it, and a punch of oval shape workable within saidopening within the inner ends of the teeth of said serrations, saidpunch having a recessed bottom the surfaces of which are inclined at alow angle to the horizontal and which intersect the vertical walls ofthe punch at acute angles, said bottom surfaces intersecting each otherat obtuse angles.

References Cited in the file of this patent UNITED STATES PATENTS956,434 Schwartz Apr. 26, 1910 2,120,329 Henneke et a1. June -14, 19382,856,939 Fleming Oct. 21, 1958 FOREIGN PATENTS 5,260 Great Britain Mar.2, 1911

1. IN A PUNCH AND DIE MACHINE MEANS FOR TEARING FROM A PAPER WORK SHEETA PAPER STRIP HAVING OPPOSITE SOFT BEVELED EDGES CONSTITUTED BY ACONTINUOUS SERIES OF UNIFORM SERRATIONS, COMPRISING A DIE HAVING ANOPENING, OPPOSITE SIDES OF WHICH ARE EACH PROVIDED WITH A CONTINUOUSSERIES OF UNIFORM HORIZONTALLY PROJECTING SERRATIONS AND A PUNCH ADAPTEDTO WORK WITHIN SAID OPENING WITHIN THE INNER ENDS OF THE TEETH OF SAIDDIE SERRATIONS, SAID PUNCH HAVING A RECESSED BOTTOM THE SURFACES OFWHICH ARE INCLINED AT A LOW ANGLE TO THE HORIZONTAL AND WHICH INTERSECTTHE OPPOSITE VERTICAL WALLS OF THE PUNCH AT ACUTE ANGLES.